Chapter 11.4, Problem 11P

(a)

To determine

To test: ${\displaystyle \sum x=79.6},{\displaystyle \sum y=72.1,{\displaystyle \sum x^2=1057.76,{\displaystyle \sum y^2=867.49}}},$

${\displaystyle \sum xy=957.84,r\approx \mathrm{0.956.}}$

(b)

To determine

To test: The claim that $\rho >0$ at 0.01 level of significance.

(c)

To determine

To test: $S_e\approx 0.1527,a\approx 1.965,b\approx 0.758$

(d)

To determine

To find: The predicted dealer invoice when the list price is 14 (thousanddollars).

(e)

To determine

To find: The 85% confidence interval for $y$ when $x=14$.

(f)

To determine

To test: The claim that $\beta >0$ at 0.01 level of significance.